Well, sort of.
After you accept the match, but before you select you units, you can alt+F4 or whatever shut down game, which cancels match without forfeiting a loss. (everyone knows about this right?) Which is good for dodging people with annoying golems, or you're just sick of playing against. That screen also shows what map will be played on, which means an entrepreneuring player can cherry pick his map.
If everyone exploits the same system its a good as fixed! You're welcome.
